Index: base/stdint_.h
--- base/stdint_.h.orig	2020-09-10 17:36:49.000000000 +0200
+++ base/stdint_.h	2020-09-12 10:27:25.834031000 +0200
@@ -70,6 +70,13 @@
    typedef unsigned long long uint64_t;
 #  define STDINT_TYPES_DEFINED
 # endif
+#ifdef __sun__
+#  include <sys/int_types.h>
+#  define STDINT_TYPES_DEFINED
+#endif
+#ifdef __FreeBSD__
+#  define STDINT_TYPES_DEFINED
+#endif
    /* other archs may want to add defines here,
       or use the fallbacks in std.h */
 #endif
Index: configure
--- configure.orig	2020-09-12 10:27:25.837955000 +0200
+++ configure	2020-09-12 14:13:18.419667000 +0200
@@ -4684,9 +4684,7 @@
 
 
 if test $GCC = yes; then
-    cflags_to_try="-Wall -Wstrict-prototypes -Wundef \
--Wmissing-declarations -Wmissing-prototypes -Wwrite-strings \
--fno-strict-aliasing -Werror=declaration-after-statement \
+    cflags_to_try="-fno-strict-aliasing -Werror=declaration-after-statement \
 -fno-builtin -fno-common -Werror=return-type $CFLAGS_LARGEFILE"
     optflags_to_try="$CC_OPT_FLAGS_TO_TRY"
     dbgflags_to_try="$CC_DBG_FLAGS_TO_TRY"